The former "Two and a Half Men" star's second wife, Denise Richards, has been looking after Sheen's four-year-old sons Bob and Max since Mueller was stripped of custody and admitted to a drug rehabilitation facility in May.

She spent Nov. 1 with her kids for the first time in months, and has since revealed plans to regain full custody, but the news angered Sheen and he launched into a Twitter rant that morning to slam officials at America's Department of Child and Family Services (DCFS) for their handling of the case.

He unleashed another tirade against Mueller during an interview on "TMZ Live" last week, when he warned there will be a "reckoning" after accusing the recovering addict of putting their boys' lives in danger by allegedly using illegal substances while they were in her care.